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Hypoxanthine causes endothelial dysfunction through oxidative stress-induced apoptosis.

You-Jin Kim1, Hye-Myung Ryu2, Ji-Young Choi3

  • 1Division of Nephrology and Department of Internal Medicine, Kyungpook National University School of Medicine, Daegu, South Korea; BK21 Plus KNU Biomedical Convergence Program, Department of Biomedical Science, Kyungpook National University, Daegu, South Korea; Cell and Matrix Research Institute, Kyungpook National University, Daegu, South Korea.

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High hypoxanthine levels cause endothelial cell death and dysfunction by increasing reactive oxygen species (ROS) and apoptosis. Antioxidants and caspase inhibitors protect against these harmful effects in vascular disease.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Vascular Biology

Background:

  • Endothelial cell injury and dysfunction are key in vascular diseases.
  • Reactive oxygen species (ROS) contribute to endothelial damage.
  • Elevated hypoxanthine levels, linked to smoking and alcohol, are implicated.

Purpose of the Study:

  • To investigate the direct role of hypoxanthine in endothelial dysfunction.
  • To examine hypoxanthine's effects on human umbilical vascular endothelial cells (HUVECs).

Main Methods:

  • HUVECs were treated with hypoxanthine.
  • Cell death, ROS production, and apoptosis-related protein expression were analyzed.
  • Effects of N-acetylcysteine and Z-VAD-fmk (pancaspase inhibitor) were assessed.

Main Results:

  • Hypoxanthine induced significant cell death and ROS production in HUVECs.
  • Hypoxanthine triggered apoptosis via regulating apoptosis-related proteins.
  • N-acetylcysteine and Z-VAD-fmk pretreatment inhibited hypoxanthine-induced apoptosis by reducing ROS and caspase activity.

Conclusions:

  • Increased extracellular hypoxanthine directly causes endothelial dysfunction.
  • This dysfunction is mediated by ROS production and apoptosis.
  • Findings suggest a link between hypoxanthine levels and vascular disease pathogenesis.